FAIR VALUE MEASUREMENTS - Summary of Financial Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Ginnie Mae loans subject to repurchase right	$ 769,067	$ 807,283
Liabilities:
Ginnie Mae loans subject to repurchase right	776,777	817,271
Non-Recurring Fair Value Measurements
Assets:
Total assets at fair value	769,067	807,283
Liabilities:
Total liabilities at fair value	776,777	817,271
Non-Recurring Fair Value Measurements \| Ginnie Mae
Assets:
Ginnie Mae loans subject to repurchase right	769,067	807,283
Liabilities:
Ginnie Mae loans subject to repurchase right	776,777	817,271
Non-Recurring Fair Value Measurements \| Level 1
Assets:
Total assets at fair value	0	0
Liabilities:
Total liabilities at fair value	0	0
Non-Recurring Fair Value Measurements \| Level 1 \| Ginnie Mae
Assets:
Ginnie Mae loans subject to repurchase right	0	0
Liabilities:
Ginnie Mae loans subject to repurchase right	0	0
Non-Recurring Fair Value Measurements \| Level 2
Assets:
Total assets at fair value	769,067	807,283
Liabilities:
Total liabilities at fair value	776,777	817,271
Non-Recurring Fair Value Measurements \| Level 2 \| Ginnie Mae
Assets:
Ginnie Mae loans subject to repurchase right	769,067	807,283
Liabilities:
Ginnie Mae loans subject to repurchase right	776,777	817,271
Non-Recurring Fair Value Measurements \| Level 3
Assets:
Total assets at fair value	0	0
Liabilities:
Total liabilities at fair value	0	0
Non-Recurring Fair Value Measurements \| Level 3 \| Ginnie Mae
Assets:
Ginnie Mae loans subject to repurchase right	0	0
Liabilities:
Ginnie Mae loans subject to repurchase right	$ 0	$ 0